D is your answer for your question
notice, the denominator for each fraction is the same, thus the LCD is just 3.

If he runs 6.5 metres per second, then you multiply 6.5 by 4 to get 26m
The probability that the number picked is less than 84 p(A) is:
number of possible events with picked number less than 84/ total number of possible events = 4/7
The complement event of A is that event A does not occur. If the picked number is not less than 84 ( this means is greater than 84 or is 84). The probability of the complement event is:1- p(A)=3/7
Solution: B
So,
Matt answered 20 out of 25 questions.

We need to get the denominator to be 100. We can do that by multiplying the fraction by a form of 1.

From here, it should be easy to see that Matt has answered 80% of his test.